ML17059B075
| ML17059B075 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/05/1996 |
| From: | Terry C NIAGARA MOHAWK POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-94-02, GL-94-2, NMP2L-1613, NUDOCS 9603130118 | |
| Download: ML17059B075 (6) | |
Text
CATEGORY j.
REGULAT..A INFORMATION DISTRIBUTION A'STEM (RIDS)
ACCESSTQN gPR:9603130118 DOC.DATE: 96/03/05 NOTARIZED:
NO DOCKET FACIL".5~~.9)'P. Nine Mile Point Nuclear Station, Unit 2, Niagara Moha 05000410 AUTH.NARE'UTHOR AFFILIATION TERRY,C.D.
N'agara Mohawk Power Corp.
RiiCIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk) 4
SUBJECT:
Provides schedule for response to GL 94-02, "Long-Term Solutions
& Upgrade of Interim Operating Recommendations for Thermal Hydraulic Instabilities in BWRs."
DISTRIBUTION CODE:.A001D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: OR Submittal:
General Distribution NOTES:
RECIPIENT ZD CODE/NAME PDl-1 LA HOOD,D COPIES LTTR ENCL RECIPIENT ID CODE/NAME PD1-1 PD COPIES LTTR ENGL E
INTERNAL: ACRS NRR/DE/EMCB NRR/DSSA/SPLB NUDOCS-ABSTRACT EXTERNAL: NOAC FILE CENTE NRR DRCH/HICB NRR/DSSA/SRXB OGC/HDS3 NRC PDR D
U E
NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE!
CONTACT THE DOCUMENT CONTROL DESK, ROOM OWFN SD-5(EXT. 415-2083)
TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 18 ENCL
A I
NIAGARAMOHAWKPOWER CORPORATION/NINE MILEPOINT NUCLEAR STATION, P.O. BOX 63, LYCOMING,N.Y.13093/TEL (315) 349-7263 FAX(315) 3494753 CARL D. TERRY Vice President Nuclear Engineering March 5, 1996 NMP2L 1613 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE; Nine MilePoint Unit 2 Docket No. 50-410
Subject:
Generic Letter 94-02, "Long-Term Solutions and Upgrade ofinteri 0perating Recommendations for Thermal-Hydraulic TnstabilMes in Boiling Water Reactors" Gentlemen:
By letter dated July 11, 1994, the Commission issued Generic Letter 94-02, "Long-Term Solutions and Upgrade of Interim Operating Recommendations for Thermal-Hydraulic Instabilities in Boiling Water Reactors."
Generic Letter 94-02, in part, requested that licensees submit a plan describing the long-term stability solution option it has selected and the associated implementation schedule.
Our letter dated November 8, 1994, indicated that Niagara Mohawk had selected stability Option III, as delineated in NEDO-31960, BWR Owners'roup Long-Term Solutions Licensing Methodology, to address the thermal-hydraulic stability issue at Nine MilePoint Unit 2 (NMP2). Specifically, Niagara Mohawk elected to replace the current Power Range Monitor system with the General Electric (GE) Nuclear Measurement Analysis and Control (NUMAC)Power Range Neutron Monitor (PRNM) system with the core stability monitoring function (Oscillation Power Range Monitor (OPRM). The NUMAC-PRNMtogether with the OPRM uses LPRM signals to initiate a reactor SCRAM upon identification of neutron flux oscillations characteristic of a thermal-hydraulic instability. Accordingly, the NUMAC-PRNM meets the detection and suppression criteria of General Design Criteria-12, Suppression of Reactor Power Oscillations.
Our letter also indicated that the NUMAC-PRNMwas scheduled to be installed by the end of the fifthrefueling outage (RFO5) scheduled to begin in late 1996. At that time, NMP2 was scheduled to be the fourth nuclear station, behind Hatch (Units 1 and 2) and Fermi, to install the NUMAC-PRNM. Installation in RFO5 was considered achievable based on GE's projected issuance of the NUMAC-PRNMfinal design by December 1995, the required Technical Specification amendment application submitted in January 1996, the experience derived from the Hatch and Fermi installations and a starting date of October ll, 1996 for RFO5.
The OPRM trip function was scheduled to be monitored for one cycle to ensure the monitor would not result in unnecessary challenges to plant safety g o 0 0 @Qtems prior to activation in RFO6.
9603i30ii8 960305 PDR ADQCK 05000410 P
PDR l
0
1 t
P 4
Page 2 The purpose of this letter is to inform you that because of significant delays in GE's design delivery schedule, Niagara Mohawk willdefer the NUMAC-PRNMinstallation from RFO5 until RFO6.
RFO6 is currently scheduled to begin in May 1998.
Accordingly, the OPRM trip function willbe activated in RFO7 (i.e., one cycle for monitoring) which is scheduled to begin in May 2000.
GE's design delays willresult in insufficient time to ensure quality design, testing, and thorough planning for implementation of the NUMAC-PRNM modification in RFO5 (which is planned to begin on September 28, 1996).
Sufficient time to ensure proper reviews, testing and planning of the NUMAC-PRNMmodification has become even more critical as Niagara Mohawk, and the Commission's reviewers, willnot benefit from Hatch and Fermi's experience due to their deferrals.
NMP2 willcontinue to operate in accordance with the Boiling Water Reactor Owners'roup Interim Corrective Action recommendations until RFO7 to preclude thermal-hydraulic instabilities.
Sincerely, C. D. Terry Vice President - Nuclear Engineering CDT/JMT/kap xc:
Regional Administrator, Region I Mr. B. S. Norris, Senior Resident Inspector Mr. L. B. Marsh, Director, Project Directorate I-l, NRR Mr. G. E. Edison, Senior Project Manager, NRR Records Management
0-
~g/
1>>
~ ~
e' a
V 4
r IJ
't L